Radio coil winding



June 1931. R. F. SICKLES ET AL 1,807,606

RADIO COIL WINDING Filed Sept. 19, 1929 INVENTORIS. 6 .Q'M .4

M QM

opening through the wall of the tube.

Patented June 2, 1931 UNITED STATES PATENT; OFFICE ROY F. SICKLES AND FRANK W. SICKLES, OF SPRINGFIELD, MASSACHUSETTS RADIO COIL WINDING Application filed September 19, 1929. Serial No. 393,788.

This invention relates to improvements in electrical coils and is directed more particularly to improvements in coils of the solenoid type such as are used in radio apparatus and the like.

Solenoid coils, asis well known, comprise tubular supports or cores on which an inductance is formed by winding a wire or wires spirally thereon.

Present-day demands require that the number of turns of coils be exact, that the coil be disposed in a certain way on the support in the form of a tube and it is an ordinary requirement that the coil be provided with one or more taps from certain turns thereof.

To provide the taps there are at least two common methods in use which are as follows :According to one method the coil winding is started at a definite point on the tube and at a predetermined distance from this point is located a round loop receiving When the required number of turns of wire'have been wound on. the tube an instrument is inserted in the tube with its end extending up through the opening so as to hook onto the wire of the particular turn and pull it downwardly and out the end of the tube forming a loop for a tap. This opening of course must be sufiiciently large to allow the hook to pass therethrough and is therefore necessarily many times larger than the wire itself. Due to many causes this turn of the wire which it is desired to loop for a tap does not always pass a over the center of the opening so that as the wire is pulled downwardly to form the loop there is a tendency of the wire to overlie the axis of the opening. That is, the turn tends to shift. This shifting of the wire causes a separating of the turns and is objectionable for many obvious reasons.

According to the other method a relatively small opening is provided in'the wall of the tube which is of a diameter to allow a wire doubled upon itself to pass therethrough. This is'located of course as accurately as is possible with reference to the turn which is to be tapped and'the tap is formed by looping from the spirit and scope thereof.

the wire from the particular turn outside the i work and passing the loop downwardly through the opening. This operation is bothersome and consumes time so that the production is retarded and manufacturing costs increased and there is the further objection that the wire forming kink. 7

According to the novel features of this invention we overcome the objections and disadi a-ntages referred to above by providing a slot which extends circumferentially of the support for guiding the wire for forming the the loop tends to tap loop and associate therewith a larger opening in communication therewith for receiving a hook for the looping operation. The slot is relatively narrow for a loop wire guiding function only, whereby a particular turn may be looped without the liability of the wire shifting on the tube while the hook opening may be utilized for its function without interfering with the function of the loop slot.

The invention in the form at present preferred will be described in connection with the accompanying drawings, but it will be understood that various changes may be made in the form thereof without departing vationalviews showing modified forms of the loop forming slot, and

Fig. 7 is an enlarged partial elevational view of a tube showing a further modified form of the invention.

Referring to the drawings, the invention will now be described in detail,

A core or support in the form of a tube is represented at S which is adapted to receive a coil winding. If desired this may be threaded to receive the turns of the wire forming the coil and may be of any certain diameter and length to receive any number or arrangement of turns. At the point where a certain turn of a coil windingv overlies the support and where it is desired to provide a tap at the particular turn there is provided an elongated loop opening at 2 which "extends circumferentially of. the support. This as distinguished from the large circular opening of the prior art is relatively narrow and may be in width about twice or three times the diameter of the wire forming the coil winding.

Extending longitudinally of the tube and disposed at a side of the slot there is a hook opening 4 which is'in communication with the slot. Thismay be in various shapes and is intended'to permitthe passageof a hook therethrough as will later appear. As will be seen, this loop opening or slot provides an edge which extends circumferentially of the supporting tube and functions as a guide for a loop of wire as it is pulled downwardly therethrough.

As in Figs. 2, 3 and 4a coil G is formed by winding wire on the tube in any usual well known way. For instance the tube may be rotated and wire W guided thereonto by a guide G while it is tensione'd by pressure as it passes through the fingers. The guide and support may be moved relative to one another to obtain the desired lay or pitch of thewindin'g and as the turn to'be tapped passes over the slot 2 the tube is held against rotation. wA hook H is then passed inside the tube and its forward end slipped up throughthe opening so that the end may overlie and engage the turn of thewinding to be looped fora tap. The hook His pulled downwardly and font through the tube bringing the wire with it. The wire is tensioned by the pressure of the fingers meanwhile so asto'form a loop L- By means of the hook in the loop the loop may be twisted or an- 7 V 'ohored"about a terminal T and when so anchored the support is then rotated to complete thewinding of the coil.

The modification of the invention shown in i Fig. 5 will now be described. In this formthetubular core is provided with an elongated circumferentially disposed slot 10 as .in "the former .case and a. hook receiving angular opening 12 in communication therewith. In Fig.6 asimilar slot 14 is in commu-nicationwith a circular hook opening 16.

In Fig. 7 there is shown an angularopening 18. In this case the "sides 20 of the openin'g. are disposed at right angles toa bisec-tor of the angles'22 between theturn 24: of the coilrand the loop forming parts "26 of the loop 28. With this modification of the intending circumferentially of the core, while the hook opening extends longitudinally thereof. I

From the foregoing it will be observed that we have provided means to facilitate the forming of a loop and means separate therefrom to hold the wire forming the loop and thereby the looped turn against shifting. Bv the means of all of which we overcome the objections and disadvantages incident to the prior art methods and at the same time effect economy in manufacture as well as increase production and produce coils which are accurate in all respects.

The principles of the invention may be utilized in variousjways without. departing from the spirit and scope thereof, therefore we do not wish to be limited by the foregoing disclosure but desire to claim theinvention as broadly as'the law allows.

What we claim is:

1. A support for a tapped inductance comp-rising-in combination, a supportingtube having an opening in the side wall thereof, said opening being formed bya combined,

loop-slot and hook opening, said loop-slot having a side extending circumferentially of the tube and 'thehook opening having sides which extend angularly from said slot and longitudinally of said tube. V I 2. A support for atapped inductance coI-nprising in combination, a supporting tube having in the side .wall thereof a loop-slot and an opening for receiving ahook, the loop slotincluding'a guiding side edge extending circumferential ly of the support and i the hook opening including side edges disposed 'angularly with respect thereto and ex- "tending longitudinally of the tube, all ofsaid edgesbeing connected together whereby the loo'p slot and hook opening are combined as a single opening with the loop-slot extending circumferentially of the tube andthe hook opening portion extending axially thereof.

P Q-r pe inductance comprising in combination a supporting tub having in'the side W l there/OM loo-p'sldt defined by a side edge extendin'gicirc'umlferentially of the .tube and an opening for re- 'ce iving-aihook the-side edges of which extend longitudinally of saidtube, the said si'de edges being joined togethervwhereby the slot 7 and opening are combinedasa single opening with a slotfpolrtion thereof extending circumres tures.

ROY F. SIGKLES. FRANK W. SICKLES. 

